Asp.Net Core 2.0 and JQuery - Issue (Browser Close) Event

Hi Team,

 

I have created online exam solution and i need to capture timer data and save in to Database while user close browser or close Tab. (in IE, Crome, Firefox).

 

Technology : Asp.Net Core 2.0

 

I have tried :

 

1. $(window).on('unload', function () { });

 

2.

But Not working.

 

Note: I have display question page show inside iframe.

 

Please help.